Flue-damper.



PATENTED APR. 7, 1908.

4 F. M. HEATH.

FLUE DAMPER.

APPLICATION FILED SE21. 3. 1907.

is e specification.

5 or is. -5

. iii.

ft ift-E l T 0 (ZZZ wile m it may concern:

Be It known that 1,

lvll. citizen of the United States," resir Portland, in the county ofMnltnoi State of Gregon, have invented useful Flue-Damper,

heat generated in the stove decreases or incresses in intensity. Thisdamper may lie sd uSted to remem in a certain position when the normalquantity oi lieet radiated from the stove or heater, out any increase ordecrease of seat will correspondingly change the strength of the draftand alter the position oi the damper pistes so to bring the temperatureonce sgein to normal. It is Well known 'thatwlisn 'i'uel is led to thestove, especially Wood. burning stoves, heat is generated quite rs idlyand. with great intensity far beyond t is requirements needed forheating a room or for cooking purposes; To obviate this, vsrions formsoil dampers have been used to reduce the quantity of-air passing throughthe stove.

The herein described invention is simple in construction and veryresponsive to any variation in the strength of the draft passing throughthe smoke flue, and for this reason the radiation oi heat is practicallyconstant Wherever this damper is used.

Referring to the accompanying drawing; Figure 1 is an elevation of aportion of a stove pipe partly broken away showing clearly the damperand its connecting mechanism in full open position. Fig. 2 is e similarView of the device showing the damper fully closed and the connectingmechanism in a different position. Fig. 3 is a plan View of thearrangement of parts illustrated in Fig. 2. Fig. 4 is en elevstiono'fthe damper mechanism in position shown in 2 looking in the direction or"the arrow s.

I Similar reference characters are used on. all the figures to designatethe same parts.

The letter A indicates e smoke flue oi any character such as a coalcooking or, eatnig stove pipe, a furnace smoke-flue, or e for the sakeof clearness and simplicity the A r-Iii. 7, invention. will bedescribed. in'connection with on ordinary stove fiixtendnigdiemetiicslly throng 1 r stove sips A and in splsne perpendicular end 2,slightly v i lioles' made in t o" to each rod by a screwlfs.semicircular piste or leaf. 3 which pr On one side of the pipe A therods 1 and 2 have err-arm i and 5, respectively, exterior to 2. sectiono ether form it circular damper closing the gripe and at right angles totheir respective rods. "ifire arms do not lie in the same verticalplane, the arm being at a. greater LliSbu-Ilfiw' from the pipe A thanthe arm 5. They are of canal length and may be slotted in tl'ieir lowci'ends for links 6 and 7', thejlink 6 being; pivoted to the arm l.

iliclr passes ed and. nut 11) mounted on 1S accomplished tnresd'ing oneof the arms 1 as l and mounting thereon a, counterbalance Weight 11which, when moved. in either direction, changes the balance of theparts. If the Weight lae moved towards the axis of the rod 1, bothplates or leaves 3 will fall as they are connected to ether through thearms end 5 and the lin s 6- end 7. An opposite movement of Thisadjustment is desirable among other reesons for positioning the plates 3with respect to the normal. draft or the chimney into which the stovepipe enters, some chim neys, its is Well known, have s stronger draftthen otlre I v .e rod 1. ll nen e. fire is sale in e'stove provided I'jJnSSQS under i with sneutomstic dernper'sucii as a cove do so theleaves 3 thereof will assume the common indicated in EF 1g. 1. As thefire n1- cresses, s strong'r draft will pass through Projecting"forwardly from the lower encl'oithe link 7 1s.

the counterweight T 4.2 1 i v 'overcslcnces toe pistes 3 end they willrise.

the smoke fiue, and as the temperature ap proaches the height required,the draft gradually causes the leaves 3 to swing outwardly until theyreach the pointwhere their weight balances the pressure ofthe upwarddraft, this bein the normal position of the dampers. Shou d the heatdecrease in the room, as it will through exhaustion of fuel, the damperswill fall, owing to the lessened strength of the draft, giving greaterspace for the passage of heated air and thus cause the fire to growstronger. A reverse movement of the leaves from the normal, that is tosay, closing themto the passage of air, will take place should somethingquickly combustible, such as resinous wood, or a large amount of verydry wood, coal-oil, and guinerous other articles, be thrown upon theFrom the above description, it will be noted that as soon as the leaveshave reached their normal position, they will substantially remain-insaid position with possibly a slight rise and fall as the fire changes.It will therefore be seen that the damper is automatic, keeping thestove while burning always at the same temperature and thereby effectinggreat saving infuel.

It is well known that in windy weather, the draft in a chimney flue ismuch more intense than at other times, and, therefore, on theseoccasions, a greater quantity of fuel is burned than at other times. Butwith stoves equipped with the improved automatic damper, the consumptionof fuel will be no greater with an intense wind blowing than at othertimes.

Having-thus described the invention what is claimed is 2-- .1. Anautomatic damper for flues comprising a pair of plates or leaves'adaptedto swingon parallel horizontally disposed rods within the flue andextending across the center of the same, each of said rods having an armon the same side of said flue, said arms crossing, and a link pivoted toeach arm and the two to each other. i

2. An automatic flue damper com rising a pair of plates or leaves fixedon para lel horizontalrods adjacent each other journaled in the walls ofthe flue and extending centrally across the same, an arm on each rodoutside the flue, said arms being in different vertical planes andcrossing each other, links pivoted to the arms and to each other tocause said leaves to vibrate in unison and close or open,

' more or less the passage through said flue.

3. An automatic flue damper com rising two semi-circular plates orleaves wit Illl the flue attached to parallel horizontal rods adj acenteach other and journaled in the walls of the flue, an arm on each rod ata right angle thereto, said arms'crossing each other, flexible meansconnected to the ends of the arms to cause the damper plates or leavesto move in unison and preserve the ratio between the flue opening andthestrength of.

the draft therethrough and means for positively changing said ratio. 7

4. An automatic flue damper comprising two semi-circular plates orleaves within the fine and adapted to close the same, said plates orleaves attached to parallel horizontal rods adjacent each other andjo'urnaled in the walls of the flue, an arm on each rod at a right anglethereto, said arms crossing eachother, links connecting to said arms-andto each other to cause the plates or leaves to move in unison andpreserve the ratio between the 'flue opening and the strength of thedraft therethrough, and a counterweight adjustably mounted on one ofsaid arms f0 positively changing said ratio.

5. An automatic flue damper comprising two semi-circular plates attachedby their straight edges to two adjacent parallel rods extendinghorizontally through the flue, an arm on the rojecting end of each rodon the same side 0 the flue at a right angle thereto,

links attached to said arms, and a clamping screw connecting said linksto each other whereby the damper leaves may move automatically or beheld in fixed position.

6. An automatic damper comprising a pair of parallel horizontal rockingrods adjacent to each other extending through a flue and each havingfixed thereon a damper plate or leaf, an arm on the outside end of eachrod and at a right angle thereto, said arms crossing each other and onehaving its exterior screw threaded, a movable weight on the threadedarm, and a link extending downwardly from each arm said links beingpivoted togetheri 7 An automatic damper comprising a pair of parallelhorizontal rocking rods extendii'ig through a flue and a dam per p'l atefixed to each rod within the flue and movable with it, said damperplates together forming a damper adapted to close said lluc, an arm onthe outside of each rod and at a right angle thereto, said arms crossingeach other, a link extending from the end of each arm, said links beingpivotally joined at their lower ends, and a fastening at the joint tohold the damper leaves in any desired )osition.

In testimony that claim the foregoingas my own, I have hereto allixed mysignature in the presence of two witnesses.

